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Texas Instruments INA241A1IDGKR
- Part No.:
- INA241A1IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA241A1IDGKR.pdf
- Description:
- -5-V TO 110-V BIDIRECTIONAL ULTR
- Quantity:
- Payment:
- Shipping:
Inventory:1,412
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Product details
Overview
INA241A1IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for high-voltage switching systems. It operates over −5V to 110V common-mode range, delivers ±0.01% gain error and ±10µV max offset voltage, and supports 125kHz PWM rejection-enabling accurate inline motor current monitoring in 48V industrial drives.
For engineers reviewing the INA241A1IDGKR datasheet, INA241A1IDGKR pinout, INA241A1IDGKR application, or INA241A1IDGKR equivalent, this page provides verified specifications, validated VSSOP-8 pin functions, confirmed bidirectional sensing use cases in solenoid control and drone ESCs, and two technically documented alternative parts with explicit gain and drift differences.
Technical Context
The INA241A1IDGKR employs a zero-drift, multistage amplifier architecture that maintains 1.1MHz bandwidth and 8V/µs slew rate across all gains-including its fixed 10V/V configuration. Its enhanced PWM rejection circuitry actively suppresses common-mode transients up to 125kHz by holding output for 1µs during fast ΔV/Δt edges, then relying on 104dB AC-CMRR at 100kHz for subsequent attenuation.
It features dual reference inputs (REF1/REF2) enabling programmable output centering from GND to VS, supports bidirectional sensing via differential input (IN+, IN−), and draws only 2.5mA quiescent current from a 2.7V–20V supply-while sustaining operation from −40°C to 125°C with ±1ppm/°C gain drift and ±0.1µV/°C offset drift.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 10V/V-sets full-scale output to 10× shunt voltage drop, enabling precise low-current measurement with 10mΩ shunts at ±5A range. |
| Common-mode range | −5V to 110V operational-supports direct high-side sensing in 48V/60V bus systems without level-shifting or isolation. |
| Gain error | ±0.01% max at 25°C-ensures <±100µV error in 1V output span, critical for closed-loop torque control accuracy. |
| Input offset voltage | ±10µV max-enables sub-10mA resolution with 10mΩ shunt, even at −40°C to 125°C temperature extremes. |
| PWM rejection | Validated to 125kHz-suppresses gate-drive-induced common-mode noise in BLDC motor inverters without external filtering. |
| Small-signal bandwidth | 1.1MHz-captures fast overcurrent events (e.g., short-circuit rise times <300ns) before protection triggers. |
| Supply range | 2.7V to 20V-operates from single 3.3V logic rail or wide-input industrial supplies without auxiliary LDOs. |
Pinout & Package
VSSOP-8 package (DGK), 3mm × 4.9mm body, exposed thermal pad (not electrically connected), RoHS-compliant, rated for −40°C to 125°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Differential input (negative) | Connects to load side of shunt in high-side config; ground side in low-side-defines current direction polarity. |
| GND (Pin 2) | Power and reference ground | Return path for supply and internal bias; must be low-impedance connection to minimize noise coupling. |
| REF2 (Pin 3) | Reference voltage input | One half of precision divider network; tied to GND or VS to set bidirectional output midpoint (e.g., 2.5V @ 5V supply). |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure EMI immunity and thermal stability. |
| OUT (Pin 5) | Analog output | 10×(IN+ − IN−) + (REF1 + REF2)/2; rail-to-rail capable with 20mV headroom to GND and 200mV to VS. |
| VS (Pin 6) | Positive supply | 2.7V–20V analog supply; decoupling capacitor (≥1µF ceramic) required within 5mm of pin for PWM rejection integrity. |
| REF1 (Pin 7) | Reference voltage input | Second half of matched reference divider; paired with REF2 to configure unidirectional (0–VS) or bidirectional (±VS/2) output swing. |
| IN+ (Pin 8) | Differential input (positive) | Connects to bus side of shunt in high-side config; load side in low-side-completes differential sense path. |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced PWM rejection | 1µs output hold + 104dB AC-CMRR at 100kHz-eliminates need for external RC filters in 20kHz–125kHz motor drive applications. |
| Zero-drift topology | ±10µV max offset, ±0.1µV/°C drift-maintains <0.5% full-scale error over full −40°C to 125°C range without calibration. |
| Dual reference inputs | Matched internal resistor network enables precise mid-supply output offset (e.g., 2.5V @ 5V) for true bidirectional current detection. |
| Constant input bias current | 35µA typical, independent of VCM-prevents gain error shift when sensing across 110V bus, unlike voltage-dependent competitors. |
| High-speed settling | 1µs to 1% for full-scale step-enables real-time overcurrent response in safety-critical ESC and servo amplifier designs. |
Applications
| Motor Drives | Solenoids and Actuators |
|---|---|
Use Scenario: Real-time phase current feedback in 3-phase BLDC inverters for field-oriented control (FOC) in industrial pumps and HVAC compressors. IC Role / Device Role / Timing Role: High-side bidirectional current sensor with 1.1MHz bandwidth and 125kHz PWM rejection, placed inline between IGBT half-bridge and motor winding. Use Value: Enables <100ns overcurrent detection latency and ±0.2% torque linearity across 0–6000 RPM, reducing thermal derating by 15%. | Use Scenario: Closed-loop current regulation in high-reliability pneumatic solenoid valves used in medical fluid delivery systems. IC Role / Device Role / Timing Role: Low-side unidirectional current monitor with GND-referenced output, interfacing directly to 12-bit SAR ADC of microcontroller. Use Value: Delivers ±0.05A accuracy over 0.1–2A range at 125°C ambient, eliminating need for temperature compensation firmware. |
| Drone Propeller Speed Control | Cordless Power Tools |
Use Scenario: Individual ESC current monitoring in quadcopter flight controllers to detect propeller stall or imbalance during aggressive maneuvers. IC Role / Device Role / Timing Role: Bidirectional sense amplifier with REF1=VS and REF2=GND, providing ±2.5V output swing referenced to 5V supply for differential ADC input. Use Value: Achieves 50mA resolution at 30A peak with <1µs transient response-enabling real-time thrust vector correction within 2ms loop time. | Use Scenario: Battery discharge current monitoring in 18V cordless drill drivers with brushless motor and integrated battery management. IC Role / Device Role / Timing Role: High-side current sensor operating at 60V common-mode, feeding analog input of MCU's 12-bit ADC with 10mΩ shunt. Use Value: Supports 0.1C–3C discharge profiling with ±0.3% SoC estimation accuracy, extending usable battery life by 8% over 500 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Same 10V/V gain, but ±0.1% gain error and ±150µV offset; no enhanced PWM rejection circuitry. | Limited to <20kHz switching or systems with external common-mode filtering; unsuitable for direct replacement in 100kHz motor drives. | Select only for cost-sensitive, lower-precision applications where PWM rejection is handled externally. |
| MAX40056ATA+T | 10V/V gain, ±0.02% gain error, ±12µV offset, but 4.5V–36V supply and no dual-reference capability. | Requires external level-shifting for bidirectional output; lacks REF1/REF2 flexibility for mid-supply centering in 3.3V systems. | Prefer when operating above 20V supply or needing wider survival voltage (−30V to 130V), but accept design overhead for reference configuration. |
Compared with INA241A1IDGKR, INA240A1IDR trades precision and PWM robustness for lower cost, while MAX40056ATA+T extends supply range at the expense of reference flexibility-making INA241A1IDGKR optimal for compact, high-fidelity bidirectional sensing in 3.3V–20V industrial and mobility systems.
Availability
INA241A1IDGKR is available at Aetrix Electronics and suitable for motor drives, solenoid control, drone ESCs, and cordless power tools requiring stable component supply, long-term production continuity, and guaranteed traceable sourcing.
Supply support for INA241A1IDGKR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions, with deep expertise in precision signal chain and high-reliability power management ICs.
The INA241x product line was designed specifically for high-voltage, high-speed bidirectional current sensing in switching power stages-targeting motor control, battery management, and industrial automation systems demanding ultra-low drift and PWM noise immunity.
FAQ
What is the maximum common-mode voltage the INA241A1IDGKR can withstand during continuous operation?
The INA241A1IDGKR supports −5V to 110V common-mode voltage during normal operation, with survival rating up to −20V to 120V. This allows direct high-side sensing on 48V, 60V, or 72V industrial buses without external attenuation or isolation. The device maintains specified performance across this full range, including ±0.01% gain accuracy and 166dB DC-CMRR, as verified in TI's SBOSA30D datasheet Section 6.5.
Does the INA241A1IDGKR require external components for stable operation in high-PWM-noise environments?
No, the INA241A1IDGKR integrates enhanced PWM rejection circuitry that eliminates need for external RC filters in most applications. A single 1µF ceramic decoupling capacitor placed within 5mm of the VS pin is sufficient for stable 125kHz operation. The internal 1µs hold function and 104dB AC-CMRR at 100kHz suppress common-mode transients inherently-verified in Figure 7-1 and Section 7.3.1.1 of the INA241A1IDGKR datasheet.
How is bidirectional current measurement implemented using the INA241A1IDGKR reference pins?
Bidirectional operation is achieved by connecting REF1 to VS and REF2 to GND (or vice versa), setting the output midpoint to VS/2. For example, with a 5V supply, the output swings symmetrically from 0.02V to 4.8V-where voltages below 2.5V indicate reverse current flow. This configuration uses the device's matched internal reference divider (Section 7.4.1), requiring no external resistors and maintaining ±0.005% reference divider accuracy over temperature.
What is the small-signal bandwidth of the INA241A1IDGKR, and how does it impact overcurrent response time?
The INA241A1IDGKR has a small-signal bandwidth of 1.1MHz across all gain options, enabling sub-microsecond transient response. When subjected to a full-scale current step, the output settles to 1% in 1µs (Section 6.5, "Settling time"). This allows detection of fast overcurrent events-such as MOSFET shoot-through faults-in under 300ns, supporting SIL-2 functional safety compliance in motor drive designs using INA241A1IDGKR.
Can the INA241A1IDGKR operate from a 3.3V supply while maintaining full performance specifications?
Yes, the INA241A1IDGKR operates fully specified from 2.7V to 20V supply. At 3.3V, it maintains ±0.01% gain error, ±10µV offset, and 1.1MHz bandwidth-verified in Section 6.3 (Recommended Operating Conditions) and Figure 6-22 (Output Voltage vs Output Current). The output swings from 20mV above GND to 200mV below VS, delivering 0.02V–3.1V range-sufficient for direct interface with 12-bit ADCs in space-constrained 3.3V systems.
INA241A1IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.1 MHz
- Current - Input Bias:
- 35 µA
- Voltage - Input Offset:
- 5 µV
- Current - Supply:
- 2.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 20 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA241A1IDGKR FAQ
1.How can I place an order for INA241A1IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA241A1IDGKR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA241A1IDGKR reliable?
The price and inventory of INA241A1IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA241A1IDGKR is usually 5 days.
3.What payment methods are accepted for INA241A1IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA241A1IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA241A1IDGKR?
INA241A1IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA241A1IDGKR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA241A1IDGKR?
For technical support, including INA241A1IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA241A1IDGKR requirements.
6.How does Aetrix verify that INA241A1IDGKR is sourced from the original manufacturer or authorized distributors?
All INA241A1IDGKR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA241A1IDGKR meets industry standards.
7.What is the process for return or replacement of INA241A1IDGKR?
All INA241A1IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA241A1IDGKR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA241A1IDGKR part is unused and in its original packaging.
Return procedure for INA241A1IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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